CHEM Lab Assessment

Front

What class of reaction is represented by the equation Mg + HCl ⟶ MgCl2 + H2?

Back

Single replacement reaction: A reaction where one element replaces another in a compound.

Front

What is the length of a standard straw used in a lab?

Back

8 cm: The typical length for a lab straw.

Front

What is the molecular geometry of H2S?

Back

Bent: The molecular shape due to the presence of lone pairs on the central atom.

Front

What is a graduated cylinder used for in a lab?

Back

A graduated cylinder is used to measure the volume of liquids accurately.

Front

What is the chemical formula for Phosphorous trichloride?

Back

PCl3: Indicates one phosphorus atom bonded to three chlorine atoms.

Front

Define a combustion reaction.

Back

A combustion reaction is a chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of light or heat.

Front

What is the difference between a synthesis and a decomposition reaction?

Back

Synthesis: Two or more substances combine to form a new compound. Decomposition: A single compound breaks down into two or more simpler products.

Front

What is the purpose of a metric ruler in a chemistry lab?

Back

A metric ruler is used to measure lengths and dimensions accurately in metric units.

Front

What does the term 'bent' refer to in molecular geometry?

Back

'Bent' refers to a molecular shape where the bond angle is less than 180 degrees due to lone pairs on the central atom.

Front

What is the significance of using Celsius in a laboratory setting?

Back

Celsius is a metric temperature scale commonly used in scientific experiments for consistency and accuracy.